/**
 * Implementation of the Hill system for sorting atoms
 * https://en.wikipedia.org/wiki/Chemical_formula#Hill_system
 * @param a - first atom to compare
 * @param b - second atom to compare
 * @returns A value suitable for use in Array.prototype.sort.
 */
export declare function atomSorter(a: string, b: string): 0 | -1 | 1;
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